Hello Capttcha is a free PHP security system that can generate CAPTCHAs with animated images. It can send HTTP requests to the Web services API Web server of the HelloCAPTCHA site retrieve HTML to embed form fields and display an animated CAPTCHA image.This script can also send a request to verify whether the user entered a valid CAPTCHA verification code.Features ...

Pieforms provides a simple, unified way to create, validate and process forms all with a common look and feel, with support for pluggable elements, renderers and validation rules. Supports AJAX submission, date picker/other advanced controls. Requirements:PHP5+.